1 /* 2 * include/asm-parisc/processor.h 3 * 4 * Copyright (C) 1994 Linus Torvalds 5 * Copyright (C) 2001 Grant Grundler 6 */ 7 8 #ifndef __ASM_PARISC_PROCESSOR_H 9 #define __ASM_PARISC_PROCESSOR_H 10 11 #ifndef __ASSEMBLY__ 12 #include <linux/threads.h> 13 14 #include <asm/prefetch.h> 15 #include <asm/hardware.h> 16 #include <asm/pdc.h> 17 #include <asm/ptrace.h> 18 #include <asm/types.h> 19 #include <asm/percpu.h> 20 21 #endif /* __ASSEMBLY__ */ 22 23 /* 24 * Default implementation of macro that returns current 25 * instruction pointer ("program counter"). 26 */ 27 #ifdef CONFIG_PA20 28 #define current_ia(x) __asm__("mfia %0" : "=r"(x)) 29 #else /* mfia added in pa2.0 */ 30 #define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x)) 31 #endif 32 #define current_text_addr() ({ void *pc; current_ia(pc); pc; }) 33 34 #define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size) 35 #define TASK_SIZE TASK_SIZE_OF(current) 36 #define TASK_UNMAPPED_BASE (current->thread.map_base) 37 38 #define DEFAULT_TASK_SIZE32 (0xFFF00000UL) 39 #define DEFAULT_MAP_BASE32 (0x40000000UL) 40 41 #ifdef CONFIG_64BIT 42 #define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000) 43 #define DEFAULT_MAP_BASE (0x200000000UL) 44 #else 45 #define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32 46 #define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32 47 #endif 48 49 #ifdef __KERNEL__ 50 51 /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc. 52 * prumpf */ 53 54 #define STACK_TOP TASK_SIZE 55 #define STACK_TOP_MAX DEFAULT_TASK_SIZE 56 57 #endif 58 59 #ifndef __ASSEMBLY__ 60 61 /* 62 * IRQ STACK - used for irq handler 63 */ 64 #ifdef __KERNEL__ 65 66 #define IRQ_STACK_SIZE (4096 << 2) /* 16k irq stack size */ 67 68 union irq_stack_union { 69 unsigned long stack[IRQ_STACK_SIZE/sizeof(unsigned long)]; 70 }; 71 72 DECLARE_PER_CPU(union irq_stack_union, irq_stack_union); 73 74 void call_on_stack(unsigned long p1, void *func, unsigned long new_stack); 75 76 #endif /* __KERNEL__ */ 77 78 /* 79 * Data detected about CPUs at boot time which is the same for all CPU's. 80 * HP boxes are SMP - ie identical processors. 81 * 82 * FIXME: some CPU rev info may be processor specific... 83 */ 84 struct system_cpuinfo_parisc { 85 unsigned int cpu_count; 86 unsigned int cpu_hz; 87 unsigned int hversion; 88 unsigned int sversion; 89 enum cpu_type cpu_type; 90 91 struct { 92 struct pdc_model model; 93 unsigned long versions; 94 unsigned long cpuid; 95 unsigned long capabilities; 96 char sys_model_name[81]; /* PDC-ROM returnes this model name */ 97 } pdc; 98 99 const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */ 100 const char *family_name; /* e.g. "1.1e" */ 101 }; 102 103 104 /* Per CPU data structure - ie varies per CPU. */ 105 struct cpuinfo_parisc { 106 unsigned long it_value; /* Interval Timer at last timer Intr */ 107 unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */ 108 unsigned long irq_count; /* number of IRQ's since boot */ 109 unsigned long irq_max_cr16; /* longest time to handle a single IRQ */ 110 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */ 111 unsigned long hpa; /* Host Physical address */ 112 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */ 113 #ifdef CONFIG_SMP 114 unsigned long pending_ipi; /* bitmap of type ipi_message_type */ 115 #endif 116 unsigned long bh_count; /* number of times bh was invoked */ 117 unsigned long prof_counter; /* per CPU profiling support */ 118 unsigned long prof_multiplier; /* per CPU profiling support */ 119 unsigned long fp_rev; 120 unsigned long fp_model; 121 unsigned int state; 122 struct parisc_device *dev; 123 unsigned long loops_per_jiffy; 124 }; 125 126 extern struct system_cpuinfo_parisc boot_cpu_data; 127 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data); 128 129 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF) 130 131 typedef struct { 132 int seg; 133 } mm_segment_t; 134 135 #define ARCH_MIN_TASKALIGN 8 136 137 struct thread_struct { 138 struct pt_regs regs; 139 unsigned long task_size; 140 unsigned long map_base; 141 unsigned long flags; 142 }; 143 144 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs)) 145 146 /* Thread struct flags. */ 147 #define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */ 148 #define PARISC_UAC_SIGBUS (1UL << 1) 149 #define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */ 150 151 #define PARISC_UAC_SHIFT 0 152 #define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS) 153 154 #define SET_UNALIGN_CTL(task,value) \ 155 ({ \ 156 (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \ 157 | (((value) << PARISC_UAC_SHIFT) & \ 158 PARISC_UAC_MASK)); \ 159 0; \ 160 }) 161 162 #define GET_UNALIGN_CTL(task,addr) \ 163 ({ \ 164 put_user(((task)->thread.flags & PARISC_UAC_MASK) \ 165 >> PARISC_UAC_SHIFT, (int __user *) (addr)); \ 166 }) 167 168 #define INIT_THREAD { \ 169 .regs = { .gr = { 0, }, \ 170 .fr = { 0, }, \ 171 .sr = { 0, }, \ 172 .iasq = { 0, }, \ 173 .iaoq = { 0, }, \ 174 .cr27 = 0, \ 175 }, \ 176 .task_size = DEFAULT_TASK_SIZE, \ 177 .map_base = DEFAULT_MAP_BASE, \ 178 .flags = 0 \ 179 } 180 181 /* 182 * Return saved PC of a blocked thread. This is used by ps mostly. 183 */ 184 185 struct task_struct; 186 unsigned long thread_saved_pc(struct task_struct *t); 187 void show_trace(struct task_struct *task, unsigned long *stack); 188 189 /* 190 * Start user thread in another space. 191 * 192 * Note that we set both the iaoq and r31 to the new pc. When 193 * the kernel initially calls execve it will return through an 194 * rfi path that will use the values in the iaoq. The execve 195 * syscall path will return through the gateway page, and 196 * that uses r31 to branch to. 197 * 198 * For ELF we clear r23, because the dynamic linker uses it to pass 199 * the address of the finalizer function. 200 * 201 * We also initialize sr3 to an illegal value (illegal for our 202 * implementation, not for the architecture). 203 */ 204 typedef unsigned int elf_caddr_t; 205 206 #define start_thread_som(regs, new_pc, new_sp) do { \ 207 unsigned long *sp = (unsigned long *)new_sp; \ 208 __u32 spaceid = (__u32)current->mm->context; \ 209 unsigned long pc = (unsigned long)new_pc; \ 210 /* offset pc for priv. level */ \ 211 pc |= 3; \ 212 \ 213 regs->iasq[0] = spaceid; \ 214 regs->iasq[1] = spaceid; \ 215 regs->iaoq[0] = pc; \ 216 regs->iaoq[1] = pc + 4; \ 217 regs->sr[2] = LINUX_GATEWAY_SPACE; \ 218 regs->sr[3] = 0xffff; \ 219 regs->sr[4] = spaceid; \ 220 regs->sr[5] = spaceid; \ 221 regs->sr[6] = spaceid; \ 222 regs->sr[7] = spaceid; \ 223 regs->gr[ 0] = USER_PSW; \ 224 regs->gr[30] = ((new_sp)+63)&~63; \ 225 regs->gr[31] = pc; \ 226 \ 227 get_user(regs->gr[26],&sp[0]); \ 228 get_user(regs->gr[25],&sp[-1]); \ 229 get_user(regs->gr[24],&sp[-2]); \ 230 get_user(regs->gr[23],&sp[-3]); \ 231 } while(0) 232 233 /* The ELF abi wants things done a "wee bit" differently than 234 * som does. Supporting this behavior here avoids 235 * having our own version of create_elf_tables. 236 * 237 * Oh, and yes, that is not a typo, we are really passing argc in r25 238 * and argv in r24 (rather than r26 and r25). This is because that's 239 * where __libc_start_main wants them. 240 * 241 * Duplicated from dl-machine.h for the benefit of readers: 242 * 243 * Our initial stack layout is rather different from everyone else's 244 * due to the unique PA-RISC ABI. As far as I know it looks like 245 * this: 246 247 ----------------------------------- (user startup code creates this frame) 248 | 32 bytes of magic | 249 |---------------------------------| 250 | 32 bytes argument/sp save area | 251 |---------------------------------| (bprm->p) 252 | ELF auxiliary info | 253 | (up to 28 words) | 254 |---------------------------------| 255 | NULL | 256 |---------------------------------| 257 | Environment pointers | 258 |---------------------------------| 259 | NULL | 260 |---------------------------------| 261 | Argument pointers | 262 |---------------------------------| <- argv 263 | argc (1 word) | 264 |---------------------------------| <- bprm->exec (HACK!) 265 | N bytes of slack | 266 |---------------------------------| 267 | filename passed to execve | 268 |---------------------------------| (mm->env_end) 269 | env strings | 270 |---------------------------------| (mm->env_start, mm->arg_end) 271 | arg strings | 272 |---------------------------------| 273 | additional faked arg strings if | 274 | we're invoked via binfmt_script | 275 |---------------------------------| (mm->arg_start) 276 stack base is at TASK_SIZE - rlim_max. 277 278 on downward growing arches, it looks like this: 279 stack base at TASK_SIZE 280 | filename passed to execve 281 | env strings 282 | arg strings 283 | faked arg strings 284 | slack 285 | ELF 286 | envps 287 | argvs 288 | argc 289 290 * The pleasant part of this is that if we need to skip arguments we 291 * can just decrement argc and move argv, because the stack pointer 292 * is utterly unrelated to the location of the environment and 293 * argument vectors. 294 * 295 * Note that the S/390 people took the easy way out and hacked their 296 * GCC to make the stack grow downwards. 297 * 298 * Final Note: For entry from syscall, the W (wide) bit of the PSW 299 * is stuffed into the lowest bit of the user sp (%r30), so we fill 300 * it in here from the current->personality 301 */ 302 303 #ifdef CONFIG_64BIT 304 #define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT)) 305 #else 306 #define USER_WIDE_MODE 0 307 #endif 308 309 #define start_thread(regs, new_pc, new_sp) do { \ 310 elf_addr_t *sp = (elf_addr_t *)new_sp; \ 311 __u32 spaceid = (__u32)current->mm->context; \ 312 elf_addr_t pc = (elf_addr_t)new_pc | 3; \ 313 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \ 314 \ 315 regs->iasq[0] = spaceid; \ 316 regs->iasq[1] = spaceid; \ 317 regs->iaoq[0] = pc; \ 318 regs->iaoq[1] = pc + 4; \ 319 regs->sr[2] = LINUX_GATEWAY_SPACE; \ 320 regs->sr[3] = 0xffff; \ 321 regs->sr[4] = spaceid; \ 322 regs->sr[5] = spaceid; \ 323 regs->sr[6] = spaceid; \ 324 regs->sr[7] = spaceid; \ 325 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \ 326 regs->fr[ 0] = 0LL; \ 327 regs->fr[ 1] = 0LL; \ 328 regs->fr[ 2] = 0LL; \ 329 regs->fr[ 3] = 0LL; \ 330 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \ 331 regs->gr[31] = pc; \ 332 \ 333 get_user(regs->gr[25], (argv - 1)); \ 334 regs->gr[24] = (long) argv; \ 335 regs->gr[23] = 0; \ 336 } while(0) 337 338 struct task_struct; 339 struct mm_struct; 340 341 /* Free all resources held by a thread. */ 342 extern void release_thread(struct task_struct *); 343 344 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm); 345 346 extern unsigned long get_wchan(struct task_struct *p); 347 348 #define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0]) 349 #define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30]) 350 351 #define cpu_relax() barrier() 352 353 /* Used as a macro to identify the combined VIPT/PIPT cached 354 * CPUs which require a guarantee of coherency (no inequivalent 355 * aliases with different data, whether clean or not) to operate */ 356 static inline int parisc_requires_coherency(void) 357 { 358 #ifdef CONFIG_PA8X00 359 return (boot_cpu_data.cpu_type == mako) || 360 (boot_cpu_data.cpu_type == mako2); 361 #else 362 return 0; 363 #endif 364 } 365 366 #endif /* __ASSEMBLY__ */ 367 368 #endif /* __ASM_PARISC_PROCESSOR_H */ 369